Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Convert mm to inches - easy to remember!!
Convert mm to inches - easy to remember!!
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th July 2019, 05:42 PM   #1
takitaj is offline takitaj  United States
diyAudio Member
 
Join Date: Apr 2012
Location: Maine
Default Convert mm to inches - easy to remember!!

Back in my engineering days I learned an easy and accurate enough way to convert from millimeters or centimeters to inches and back. I thought I would share it with the forums. Some may already know but for those that don't it's one easy number to remember.

The magic number is 0.03937
(actual number is 0.03937007874)

Convert millimeters to inches, multiply -> mm x 0.03937 = inches
Convert inches to millimeters, divide -> inches / 0.03937 = mm

To convert to or from centimeters simply
move it over one decimal place -> cm x 0.3937 = inches

and of course the inverse is the same -> inches / 0.3937 = cm


Have fun!

TJ

Last edited by takitaj; 15th July 2019 at 07:24 PM. Reason: add slight correction
  Reply With Quote
Old 15th July 2019, 05:47 PM   #2
leadbelly is online now leadbelly  Canada
diyAudio Member
 
leadbelly's Avatar
 
Join Date: Dec 2002
Location: Calgary, Alberta
Er, thanks?
__________________
Wise men speak because they have something to say; Fools because they have to say something. Plato
  Reply With Quote
Old 15th July 2019, 05:54 PM   #3
Galu is offline Galu  Scotland
diyAudio Member
 
Join Date: Apr 2018
Quote:
Originally Posted by takitaj View Post
. . .it's one easy number to remember. The magic number is 0.03937
Thanks, but at my age I'm struggling to remember my PIN numbers!
  Reply With Quote
Old 15th July 2019, 06:04 PM   #4
hudelson2 is offline hudelson2  United States
diyAudio Member
 
Join Date: Aug 2007
Location: Irving, Texas
An exact formula to convert millimeters to inches is to divide by 25.4.
There are exactly 25.4 millimeters to an inch.

Instead of working in inches, why not simply buy a tape measure with metric units? You can buy them at Amazon.

John
  Reply With Quote
Old 15th July 2019, 06:19 PM   #5
scottjoplin is offline scottjoplin  Wales
diyAudio Member
 
scottjoplin's Avatar
 
Join Date: Dec 2015
Location: Penrhyndeudraeth
Quote:
Originally Posted by takitaj View Post
The magic number is 0.03937
No it's not, it's 0.03937007874
  Reply With Quote
Old 15th July 2019, 06:23 PM   #6
analog_sa is offline analog_sa  Europe
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Cascais
Convert mm to inches - easy to remember!!
Quote:
Originally Posted by takitaj View Post
Have fun!

Wow! You won't believe the fun i am having. Cannot stop myself converting.
  Reply With Quote
Old 15th July 2019, 06:24 PM   #7
takitaj is offline takitaj  United States
diyAudio Member
 
Join Date: Apr 2012
Location: Maine
I have the means to measure both, thank you. Just thought I'd share for others that might be interested. As you know, in the USA we generally still use inches.

For me, 0.03937 (actual number is 0.03937007874) stuck better than 25.4, for whatever reason. We're all wired differently.

I put it out there, do with it as you wish.

Thanks for your feedback!

TJ
  Reply With Quote
Old 15th July 2019, 06:28 PM   #8
scottjoplin is offline scottjoplin  Wales
diyAudio Member
 
scottjoplin's Avatar
 
Join Date: Dec 2015
Location: Penrhyndeudraeth
Not meaning to be pedantic (of course I am) but you said easy and accurate..........
  Reply With Quote
Old 15th July 2019, 06:40 PM   #9
takitaj is offline takitaj  United States
diyAudio Member
 
Join Date: Apr 2012
Location: Maine
Accurate enough for anything anyone here would use it for! What's 0.00000007874 inches between friends?

TJ
  Reply With Quote
Old 15th July 2019, 07:23 PM   #10
badman is offline badman  United States
diyAudio Member
 
badman's Avatar
 
Join Date: Sep 2003
Location: Ashland, MA
Quote:
Originally Posted by takitaj View Post
Accurate enough for anything anyone here would use it for! What's 0.00000007874 inches between friends?

TJ
All she'll get, in some bedrooms.
__________________
"The dawn of Bose created the "Man Cave" and reduced testoterone levels worldwide by 18.5 per cent" Peteleoni
  Reply With Quote

Reply


Convert mm to inches - easy to remember!!Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Is 8 inches enough? nanl2053 Car Audio 3 29th June 2010 01:07 AM
Auto-bias - easy to convert to or not? GlidingDutchman Tubes / Valves 25 23rd July 2008 07:48 AM
How easy is it to convert from 110V AC to 240V AC? spikeyfaz Analog Line Level 19 26th December 2007 07:14 PM
Six inches... Godzilla Full Range 0 31st October 2006 05:57 PM


New To Site? Need Help?

All times are GMT. The time now is 04:59 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki